Recording more than 15 seconds:
Go to your 'clips settings' and change the 'clip length' from 15 seconds to 30, 45, or 60 seconds long.
If you haven't updated to at least v3.0.0 | 2.0.0 go do that.
To update, look for the green arrow on your Medal app. To confirm you've updated to the right version, go to settings in the bottom left, you should see v3.0.0 | 2.0.0 or higher. (If you're having trouble updating make a support ticket and we can help you out -> New Support Ticket)